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The 2nd as well as the 4th crosses are missing. It's ok to play with since that's really not where you want to hit. However it may increase the chances of breaking a string if you hit there and the long term effects on a racket are unknown. Assuming that the racquet's optimal tensions are met when all 22 mains are balanced by 22 crosses, I'd be inclined to think this may not be the greatest for your racquet's prolonged health.

Aside from the missing crosses, it seems that it is also missing 2 mains (only 20 instead of 22). Besides saying that this is not the recommended stringing pattern I wouldn't know if it effects playability or puts more stress on the racquet.

Coachgary is correct in what he says. The mains should be 1-8 miss 9 mains in 10.
The idea of missing some crosses was the belief that the racket would be faster through the air giving you more power it's not always the case.

Coachgary is correct in what he says. The mains should be 1-8 miss 9 mains in 10.
The idea of missing some crosses was the belief that the racket would be faster through the air giving you more power it's not always the case.

The mains should be in 1-10, and 12, omit 11.

The majority string 1-9 in sequence, then skip to 12, then back down through 10. This gives a shorter length to travel for tying off, plus the potential looser last main in 10 for tie off is supported by the main which is in grommet 12.

The key is to compare the strung frame to an unstrung one. The rule of thumb is to get the shape of the strung frame as close to an unstrung one as possible. However, a slightly long frame (try to keep it to 1 mm maximum) is not a problem, whereas a shorten frame is not desirable. Therefore, adjust the cross tension according to the nature of your stringing machine setup.

This pattern is intended to reduce stringbed area, reducing the air resistance and thereby increasing swing speed and power - although I'm not sure how valif these claims are.

There are two crosses missing in the lower part of the stringbed. This part isn't used much, and it's claimed that missing these two strings moves the sweetspot further up the stringbed - also increasing smash power a bit.

The missing two crosses are (sort of) balanced by skipping two mains, using 11 instead of 10 and 12. This reduces the string pattern from 22x22 to 20x20, helping to reduce the tension imbalance from the missing crosses. As coachgary said though, B11 isn't designed to take a main (on the AT900P anyway, on the AT700-type stringbed it *is* drilled & grommetted for a shared hole but no main is present).

So all in all, it's not that bad a string job. However :-
* It does void the warranty
* He shouldn't have strung a 900P that way as the B11 grommet is not designed to take 2 strings
* You should always get the standard string pattern unless you specifically request otherwise